 /*******************************************************************************
  * Copyright (c) 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.core.internal.resources.mapping;

 import java.util.*;
 import org.eclipse.core.resources.*;
 import org.eclipse.core.runtime.*;

 /**
  * Concrete implementation of IResourceDelta used for operation validation
  */
 public final class ProposedResourceDelta extends PlatformObject implements IResourceDelta {

     protected static int KIND_MASK = 0xFF;

     private HashMap children = new HashMap(8);
     private IPath movedFromPath;
     private IPath movedToPath;
     private IResource resource;
     private int status;

     public ProposedResourceDelta(IResource resource) {
         this.resource = resource;
     }

     /* (non-Javadoc)
      * @see org.eclipse.core.resources.IResourceDelta#accept(org.eclipse.core.resources.IResourceDeltaVisitor)
      */
     public void accept(IResourceDeltaVisitor visitor) throws CoreException {
         accept(visitor, 0);
     }

     /* (non-Javadoc)
      * @see org.eclipse.core.resources.IResourceDelta#accept(org.eclipse.core.resources.IResourceDeltaVisitor, boolean)
      */
     public void accept(IResourceDeltaVisitor visitor, boolean includePhantoms) throws CoreException {
         accept(visitor, includePhantoms ? IContainer.INCLUDE_PHANTOMS : 0);
     }

     /* (non-Javadoc)
      * @see org.eclipse.core.resources.IResourceDelta#accept(org.eclipse.core.resources.IResourceDeltaVisitor, int)
      */
     public void accept(IResourceDeltaVisitor visitor, int memberFlags) throws CoreException {
         if (!visitor.visit(this))
             return;
         for (Iterator iter = children.values().iterator(); iter.hasNext();) {
             ProposedResourceDelta childDelta = (ProposedResourceDelta) iter.next();
             childDelta.accept(visitor, memberFlags);
         }
     }

     /**
      * Adds a child delta to the list of children for this delta node.
      * @param delta
      */
     protected void add(ProposedResourceDelta delta) {
         if (children.size() == 0 && status == 0)
             setKind(IResourceDelta.CHANGED);
         children.put(delta.getResource().getName(), delta);
     }

     /**
      * Adds the given flags to this delta.
      * @param flags The flags to add
      */
     protected void addFlags(int flags) {
         //make sure the provided flags don't influence the kind
 this.status |= (flags & ~KIND_MASK);
     }

     /* (non-Javadoc)
      * @see org.eclipse.core.resources.IResourceDelta#findMember(org.eclipse.core.runtime.IPath)
      */
     public IResourceDelta findMember(IPath path) {
         int segmentCount = path.segmentCount();
         if (segmentCount == 0)
             return this;

         //iterate over the path and find matching child delta
 ProposedResourceDelta current = this;
         for (int i = 0; i < segmentCount; i++) {
             current = (ProposedResourceDelta) current.children.get(path.segment(i));
             if (current == null)
                 return null;
         }
         return current;
     }

     /* (non-Javadoc)
      * @see org.eclipse.core.resources.IResourceDelta#getAffectedChildren()
      */
     public IResourceDelta[] getAffectedChildren() {
         return getAffectedChildren(ADDED | REMOVED | CHANGED, IResource.NONE);
     }

     /* (non-Javadoc)
      * @see org.eclipse.core.resources.IResourceDelta#getAffectedChildren(int)
      */
     public IResourceDelta[] getAffectedChildren(int kindMask) {
         return getAffectedChildren(kindMask, IResource.NONE);
     }

     /* (non-Javadoc)
      * @see org.eclipse.core.resources.IResourceDelta#getAffectedChildren(int, int)
      */
     public IResourceDelta[] getAffectedChildren(int kindMask, int memberFlags) {
         List result = new ArrayList();
         for (Iterator iter = children.values().iterator(); iter.hasNext();) {
             ProposedResourceDelta child = (ProposedResourceDelta) iter.next();
             if ((child.getKind() & kindMask) != 0)
                 result.add(child);
         }
         return (IResourceDelta[]) result.toArray(new IResourceDelta[result.size()]);
     }
     
     /**
      * Returns the child delta corresponding to the given child resource name,
      * or <code>null</code>.
      */
     ProposedResourceDelta getChild(String name) {
         return (ProposedResourceDelta) children.get(name);
     }

     /* (non-Javadoc)
      * @see org.eclipse.core.resources.IResourceDelta#getFlags()
      */
     public int getFlags() {
         return status & ~KIND_MASK;
     }

     /* (non-Javadoc)
      * @see org.eclipse.core.resources.IResourceDelta#getFullPath()
      */
     public IPath getFullPath() {
         return getResource().getFullPath();
     }

     /* (non-Javadoc)
      * @see org.eclipse.core.resources.IResourceDelta#getKind()
      */
     public int getKind() {
         return status & KIND_MASK;
     }

     /* (non-Javadoc)
      * @see org.eclipse.core.resources.IResourceDelta#getMarkerDeltas()
      */
     public IMarkerDelta[] getMarkerDeltas() {
         return new IMarkerDelta[0];
     }

     /* (non-Javadoc)
      * @see org.eclipse.core.resources.IResourceDelta#getMovedFromPath()
      */
     public IPath getMovedFromPath() {
         return movedFromPath;
     }

     /* (non-Javadoc)
      * @see org.eclipse.core.resources.IResourceDelta#getMovedToPath()
      */
     public IPath getMovedToPath() {
         return movedToPath;
     }

     /* (non-Javadoc)
      * @see org.eclipse.core.resources.IResourceDelta#getProjectRelativePath()
      */
     public IPath getProjectRelativePath() {
         return getResource().getProjectRelativePath();
     }

     /* (non-Javadoc)
      * @see org.eclipse.core.resources.IResourceDelta#getResource()
      */
     public IResource getResource() {
         return resource;
     }

     public void setFlags(int flags) {
         status = getKind() | (flags & ~KIND_MASK);
     }

     protected void setKind(int kind) {
         status = getFlags() | (kind & KIND_MASK);
     }

     protected void setMovedFromPath(IPath path) {
         movedFromPath = path;
     }

     protected void setMovedToPath(IPath path) {
         movedToPath = path;
     }

     /**
      * For debugging purposes only.
      */
     public String toString() {
         return "ProposedDelta(" + resource + ')'; //$NON-NLS-1$
 }
 }

